diff --git a/websocket-sharp/ErrorEventArgs.cs b/websocket-sharp/ErrorEventArgs.cs
index 7ecbe795..d72fb295 100644
--- a/websocket-sharp/ErrorEventArgs.cs
+++ b/websocket-sharp/ErrorEventArgs.cs
@@ -49,16 +49,21 @@ namespace WebSocketSharp
 
     #region Internal Constructors
 
-    internal ErrorEventArgs (string message, Exception exc = null)
+    internal ErrorEventArgs (string message)
+      : this (message, null)
+    {
+    }
+
+    internal ErrorEventArgs (string message, Exception exception)
     {
       _message = message;
-      _exception = exc;
+      _exception = exception;
     }
 
     #endregion
 
     #region Public Properties
-	  
+  
     /// <summary>
     /// Gets the error message.
     /// </summary>
@@ -71,14 +76,17 @@ namespace WebSocketSharp
       }
     }
 
-	/// <summary>
-	/// Gets the exception.
-	/// </summary>
-	public Exception Exception {
+    /// <summary>
+    /// Gets the exception that caused the error.
+    /// </summary>
+    /// A <see cref="Exception"/> instance that represents the cause of the error,
+    /// or <see langword="null"/> if the error isn't due to an exception.
+    /// </value>
+    public Exception Exception {
       get {
         return _exception;
       }
-	}
+    }
 
     #endregion
   }